Conduction in single crystal and ceramic BaTiO3has been investigated using a concentration cell and activation analysis. Ionic conduction occurs near 100deg;C in single crystals containing Fe2O3while electronic conduction predominates in ``pure'' crystals from 100deg; to 600deg;C. Ceramic samples conduct predominately ionically at 100deg;C and electronically at 500deg;C. It is found that the iron ion is mobile in single crystals and that the titanium ion is immobile.
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